donation. 1  an act or instance of presenting something as a gift, grant, or contribution. 2  a gift, as to a fund; contribution.
A black or brown tongue typically is due to the overgrowth of bacteria that normally are present on the tongue. This, too, can be caused by the killing of some bacteria with antibiotics so other bacteria overgrow. But the most common cause of discoloration of the tongue is the overgrowth of a fungus. The most common fungus is called candida. But overgrowth of the candida fungus turns the tongue white. Infection with candida is called candidiasis, and when it happens on the tongue the condition is called thrush.
If you have a white tongue due to dry mouth, you can usually resolve this condition by drinking more water, using a humidifier, or rinsing with special mouthwash. You can also chew sugar-free gum or suck on sugarless lozenges to stimulate saliva production. You should avoid smoking and reduce your alcohol consumption.n addition to making your mouth more vulnerable to disease, xerostomia can cause your tongue to turn white. When your mouth becomes too dry, the papillae on your tongue can become inflamed, collecting debris without enough spit to rinse it away. Approximately ten percent of Americans suffer from dry mouth.